[jboss-jira] [JBoss JIRA] Created: (JBRULES-1212) Rete throws NoClassDefFoundError when asserting facts with classess loaded by inaccessible classloader.

Sat Sep 22 05:52:34 EDT 2007

Rete throws NoClassDefFoundError when asserting facts with classess loaded by inaccessible classloader. 
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                 Key: JBRULES-1212
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1212
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Reteoo
    Affects Versions: 4.0.1
            Reporter: Alexander Gavrilov
         Assigned To: Mark Proctor

We using drools as part of security enfocement engine in our application, based on Tapestry4 framework. Tapestry4 pages and components is abstract classes with some abstract methods, for which tapestry generates implementation at runtime. For example, if i declare page 

public abstract SomePage extends BasePage  {
}

Tapestry will generate class in default package like 
public SomePage$_0 extends BasePage  {

}

On page loading whe using instantiated page objects ans Drools Facts to ensure, that current user has permissions to load this page. In the previos verions we used (3.0.6) all worked fine. After update to version 4.0.1 whe got the NoClassDefFoundError  when triyng to assert Page object into working memory. 

This is becouse tapestry creates classes for pages in private classloader, which is child of the application classloader. When Drools tries to generate shadowing proxy for generated Page class it generate code like 

public class SomePage$_0ShadowProxy extends SomePage$_0 {
}

Later, when it tries to load this class with MapBackedClassLoader, it can not find definition for class SomePage$_0 and throws NoClassDefFoundError. This type of error does not handled correctly by drools. 

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